You may try to use some 3rd-party plugin or if you want to change current share icons with the links to your social accounts, then you have to edit the file wp-content/themes/royal/framework/shortcodes.php (find the section “! Share This Product” in line 1918), to change links you need edit the code, for example for Twitter <a href="https://twitter.com/share?url='.$permalink.'&text='.$post_title.'" class="'.$tooltip_class.'" title="'.__('Twitter', ETHEME_DOMAIN).'" target="_blank"> and replace https://twitter.com/share?url='.$permalink.'&text='.$post_title.' with a link to your Twitter account.